Tool-holder.



No. 767,036. PATENTED AUG. 9, 1904. H. W. BORGHBRS. TOOL HOLDERAPPLICATION FILED SEPT. 23, 1903.

no MODEL.

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NITED STATES Patented August 9, 1904.

PATENT OEEIcE.

HENRY W. BOHCHERS, OE PORTLAND, OREGON, ASSIGNOR OF ONE-HALF TO EDWARDTURNEY, OF PORTLAND, OREGON.

TOOL HOLDEFL SPECIFICATION forming part of Letters Patent No. 767,086,dated August 9, 1904. Application filed September 28, 1903, S i l N174,988. (No model.)

analogous machine, and has for its objects to produce a device of thischaracter of simple construction in which the tools may be read ily andaccurately adjusted and will during such adjustment move uniformly andsimultaneously a certain predetermined distance,

- one in which such movement will be accurately gaged, and one in whichthe holder and tools may be readily and accurately centered relative tothe bar.

To these ends the invention comprises the novel details of constructionand combination of parts more fully hereinafter described.

lln the accompanyingdrawings, Figure 1 is a sectional elevation showingmy improved device applied to a boring-bar. Fig. 2 is a front sideelevation, partly in section, of the holder removed. Fig. 3 is asectional elevation on the line 3 ,3 of Fig. 2. Figs. 4:, 5, and 6 aredetail views.

Referring to the drawings, 1 indicates the rotary bar ofaboring-machine. This bar, which is driven in the usual or any preferredmanner, is provided with a' central transverse opening 2, in which myimproved tool-holder 3 is in practice secu red, preferably, by a wedgeshaped bar or member 4:, driven into place between the front edge ofthe holder and the adjacent wall of the opening.

The holder 3 is preferably in the form of a substantially rectangularmetal block or body having a pair of longitudinally-extendingtoolreceiving sockets 5 disposed in endwise relation and somewhat to oneside of the transverse center of the body, these sockets being square,as herein shown, or of other non-circular form in cross-section.

6 indicates a rotary operating or adjusting member disposed at thelongitudinal center of the holder, through which latter it extends 5laterally. This member is shaped to form a pair of oppositely-arrangedcams 7, which lie within the holder in position to act upon a pair oftools 8, situated one in each of the sockets 5, these cams serving whenthe memher is rotated to act upon the adjacent inner ends of the toolsfor moving the latter outward longitudinally of the sockets, it beingapparent that inasmuch as the cams are identical in shape the toolswillmove simultane- 6O ously and a uniform distance. For rotating themember 1 form in the front end thereof a socket 9 to be engaged by asuitable tool, and for gaging the movement of the member to attain acertain predetermined movement 5 of the tools I form upon the outerfront face of the holder concentric with the member 6 a graduated scale10 and upon the member a pointer or indicating-mark 11, designed toregister with the scale-graduations as the 7 member is rotated for thusreadily and accurately obtaining the desired movement or adjustment ofthe tools. For locking the memher in its adjusted position l provide afastening member 12, preferably in the form of a screw tapped into therear end of the memher and disposed eccentrically thereof to bear uponthe adjacent wall of the opening in which the member 6 is journaled.

13 indicates a pair of set-screws tapped through the rear edge wall ofthe holder and disposed for engagement each with one of the tools 8,whereby the latter may after being brought to the proper adjustment bythe niemher 6 be fixed in such position. 5

14 designates a movable centering member or gage, preferably in the formof a bar, disposed in a longitudinal dovetail groove formed in the frontface of the body of the holder, said bar being provided at one end witha 9 right-angularlydisposed engaging head or finger 15 and in its bodyportion with a pair of longitudinally-disposed slots 16, which receivcclamping-screws l7, tapped into the body of the holder and operable forsecuring the member in its adjusted position.

18 indicates a supplemental adjusting-block, which in practice may beinserted in the socket 5 between the member 6 and the adjacent end ofthe tool 8 for securing a greater,

extension of the latter, while 19 is a similar member intended for alike purpose, but is somewhat greater in length than the block 18. Inthis connection it is to be understood that the holder will in practicebe equipped with a pair of each of these blocks, whereby one of theblocks of either size may be used with each of the tools.

At in Fig. 5 I have shown a tool identicalin all respects with the tools8, above described, except that it is of greater length, and in practicethe holder will be equipped with a pair of these longer tools.

In operation, supposing a tool to be seated in each of the sockets 5 andthe member 6 to occupy a position with its pointer registering with theZero graduation of the scale 10, rotation of the member from left toright will gradually expand the tools until the proper adjustment of thelatter (indicated upon the scale 10) has been attained, when theset-screws 13 Will be operated for locking the tools and the fasteningmember 12 for locking the member 6. If, however, a greater movement ofthe tools than can be obtained through the adjusting member 6 isdesired, one of the smaller blocks 18 is placed in position between themember and one of the tools, while still greater adjustments may beattained by bringing successively into play the larger blocks 19 andfinally the larger tools 20. After the desired adjustment of the toolshas been secured the centering member 14:, the head 15 of which engagesthe bar at one end of the opening 4, is adjusted for properly centeringthe holder and tools relative to the bar, it being understood in thisconnection that the face of the holder is provided with a scale 21,indicating the central points of the diameters of the various size holeswhich the tools will bore and upon the member 14: a pointer to bebrought into register with the desired center mark.

From the foregoing it will be seen that I produce a device of simpleconstruction which will be efficient in operation and one which isadmirably adapted for the attainment of the ends in view. It is to beunderstood, however, that I do not limit or confine myself to theprecise details herein set forth, inasmuch as Various minor changes maybe made therein without departing from the spirit or scope of theinvention.

Having thus described my invention, what I claim is- 1. In atool-holder, the combination with a borer-bar having a transverseopening, of a body adapted to be seated in said opening, a

pair of tools carried by the body, means for simultaneouslyadjusting thetools, and means for centering the body in the opening of the bar.

2. In a tool-holder, the combination with a borer-bar having atransverse opening, of a body adapted to be seated in said opening, apair of tools carried by the body, means for simultaneously adjustingthe tools, and a centering member carried by the bodyfor centering thelatter in the opening of the bar.

3. In a tool-holder, the combination with a borer-bar having atransverse opening, of a body adapted to be seated in said opening, apair of tools carried by the body, means for simultaneously adjustingthe tools, and a centering member carried by the body, said member beingmovable in a direction transversely of and formed for engagement withthe bar to center the body therein.

4. In a tool-holder, the combination with a borer-bar having atransverse opening, of a body adapted to be seated in the opening andhaving a groove extending in a direction transversely of the bar, a pairof tools carried by the body, means for simultaneously adjusting thetools, a centering-bar disposed for movement in the groove and formedfor engagement with the borer-bar to center the body therein, and meansfor locking the centering-bar.

5. In a tool-holder, the combination with a borer-bar having atransverse opening, of a body adapted to be seated in said opening andhaving a pair of sockets disposed in longitudinal endwise relation, apair of tools seated one in each socket, a movable member situatedbetween the sockets and operable for simultaneously adjusting the tools,an adjusting-block disposed between ,one of the tools and the member,and means for centering thebody in the opening of the bar.

6. In a tool-holder, the combination with a borer-bar having atransverse opening, of a body adapted to be seated in said opening, apair of tools carried by said body, a movable member associated with thebody and operable for simultaneously adjusting the tools, means forsecuring the tools in their adjusted position, and means for centeringthe body in the opening of the bar.

In testimony that I claim the foregoing as my own I have hereto affixedmy signature in the presence of two witnesses.

HENRY WV. BORCHERS.

Witnesses:

H. H. NEWHALL, WV. J. LYONS.

